Shaking-grate.



No. 725,738. PATENTED APR. 21, 1903f A. B. MARSHALL, R. ROUSE, JR- &G. G. KNIFFIN.

SHAK ING GRATE, .APPLIUATION FILED APR. 22, 1902.

N0 MODEL.

4. T a [llam a El;

INVENTOR 5 my n12 "cams FETERS co. PHOTO-UTHD (A m UNITED STATES AQUILA B. MARSHALL, OF NEW YORK,

ELIZABETH, AND GEORGE G. KNIFFIN, OF BAYONNE, NEW JE PATENT OFFICE.

N. Y., AND RICHARD ROUSE, JR, or

RSEY, AS-

SIGNORS TO THE BOYNTON FURNACE COMPANY, OF NEW YORK, N. Y.,

A CORPORATION OF NEW JERSEY.-

SHAKING -G'RATE.

SPEOKFICATION forming part of Letters Patent No. 725,738, dated April 21, 1903.

Application filed April 22,1902. Serial No. 104,157. (No model.)

To aZZ whom it may concern:

Be it known that we, AQUILA B. MARSHALL, residing in the borough of Manhattan, in the city and State of New York, and RIGH- 5 ARD ROUSE, Jr., residing at Elizabeth, in the county of Union, and GEORGE G. KNIFFIN, residing at Bayonne, in the county of Hudson, State of New Jersey, citizens of the United States, have invented a certain new and usefu'lImprovement in Shaking-Grates, of which the following is a specification.

It has long been common to form grates in sections, each section capable of rocking on trunnions, and to provide means for shaking two or more sections simultaneously by the application of force through a suitable lever. A good style of such grate is that set forth in t the United States patent to Charles Yinglin g, dated April 9, 1901, No. 671,905. The presout invention is an improvement thereon, and reference may be made to such patent for any details which are not fully set forth herein.

Our improvement leaves the space below the grate, usually termed the ash-pit, clear, the operating-arms, which extend down from each section, being close to the end of each. It is more particularly intended for small furnaces, such as the Boynton furnace, for heating buildings, and we will describe it as thus applied. Instead of connecting the arms which extend down from the endsof the several sections by links pivoted thereto and partaking of the rising and sinking motions due to the curved paths described by the several pivots we receive the pivots of the arms in corresponding open-topped slots formed in slides which are reciprocated directly forward and backward side by side at a uniform level,

the slides being'each connected directly to the same operating-lever one above and the other below the center of motion.

Our'invention induces the desired shaking action, with the advantage that all the sections of the grate may be lifted out and repaired or exchanged at any time without the labor of disconnecting any pivot. The front end of each slide is formed with a bend, one downward and the other upward, so that the connections to the operating-lever are the proper distance from the center, and the lever need be rocked only through a small portion of the circle. We have discovered that it is practicable to reciprocate such slides to the moderate extent required without any links for connection. A little looseness in the joints is all that is necessary to allow freedom of motion. We provide specially convenient and efficient means for holding the sections firmly in the position for use.

The following is a description of what we consider the best means of carrying out the invention.

The accompanying. drawings form a part of this specification.

Figure l is a plan view giving an outline of the furnace with some of the grate-sections in place. Fig. 2 is a longitudinal vertical section on the line 2 2 in Fig. 1. This shows the parts at rest, as with the fire burningthe position for use. Fig. 3 corresponds to Fig.

2 except that the mechanism is being operated to shake the grate. Fig. 4 is a front view of a portion. Fig. 5 is a plan view of a portion on a larger scale. The remaining figures are perspective views showing portions detached. Fig. 6 shows one of the sections of the grate in perspective. Fig. 7 shows a portion of a section and also a portion of the slides properly connected. Fig. 8 shows a portion of the operating-lever.

Similar letters of reference indicate corresponding parts in all the figures where they appear.

A A, &c., are portions of the supportingframe, and a represents deep notches formed therein for the reception of the trunnions of the sections. 7

B and C are the sections, respectively, of the grate arranged to rock freely. The sev- 9o eral sections 13, having the grate-fingers B, are each provided with a pair of arms B extending downward close to one end and carrying a short horizontal pin B The sections C are provided with corresponding fingers O and have similar arms (3 and a similar pin 0 l A represents fixed supports formed in the adjacent side of the ash-pit, and D and E are slides supported and guided thereon free to move forward and backward. In the upper side of the slide D are deep open slots d, each of which receives one of the pins B In the upper side of the slide E are corresponding open slots a, each of which receives a pin 0 The open slots d and e are formed by extending the metal of each slide upward, as shown by D D on the slide D and E E on the slide E. These upward extensions are on each side of earth pin, respectively, which they are to actuate, but leave the space between, which weterin an open slot. They also leavethe main body of the slide of so little height that it does not touch the corresponding pins for the other set of sections. Thus the pin B in each pair of downwardlyextending arms B extends across both slides D and E, but crosses the slide E at a point where it is unatfecled thereby. It is affected only by the slide I), which receives it in the open slot d between the upward extensions D D 30, also, the pin C always crosses the slide D at some point where it is unaffected thereby, but is engaged in the slot e between the extensions E and E on the slide E.

A isa fixed bracket extending forward from the front of the furnace and carrying a pivot A on which rocks an upright lever G, having a handle G conveniently shaped to be operated by the hand of the attendant.

The slide D is formed upward at and near the front end, as indicated by D, and carries a transverse pin D The slide E is correspondingly formed downward at and near its front end E and similarly carries a transverse pin E To operate these slides D and E, and consequently to rock the grate-sections B and O, we employ the lever G, having a long open slotg at its lower end, which is easily applied and removed by simply lifting and lowering it. Fig. 8 shows it in perspective, half the length of the slotgbeing braced by a web G Figs. 1, 2, and 3 show it in place for work. The slot engages a pivot A carried on a fixed bracket A and turning thereon as a fulcrum, and also engages the pins D and E fixed on the slides D and E,

respectively, the slot allowing for the difference in the motions.

The raised portion B at the front end of the slide D and the depressed portion E at the front end of the slide E extend out through corresponding closed slots or holes (1 in the front plate A of the ash-pit and are extended parallel to each other and to the motion of the slides. It is important to be able to hold the two slides, and consequently both sets of grate-sections B and O, stationary, with their top surfaces level. This is the position in which the parts will ordinarily be required to serve, except during the brief periods of shaking. We providea notch d in the upper edge of the part Dand connect a latch I by a loose rivet A, set in the front of the plate A, so arranged that when it is thrown over to the right, as Shown in dotted lines in Fig. 4, it will be of no effect and will allow the sections to be rocked freely; but when this is completed and the fingers B and O are brought to the level position the latch I may be thrown to the left,describing half of a circle,and mayengage in the notch d and hold the whole firmly. This latch is offset, as shown in Fig. 5, so that it presents a wide surface to receive a lifting blow to release it and a depressing blow to engage it. A keeper A in the form of a slight hook is set in the front of the plate A, adapted to receive and support the free end of this latch stiflly when in the locked position. The notched slide D D being integral and the connection with the pins B 0 having little or no lost motion, the grate-sections are held with firmness when locked. The latch islifted and thrown over when the grate-sections are to be shaken.

Our grate serves relatively to the fuel similarly to that described in the Yingling patent aforesaid. It also serves in the same manner as the Yingling device with ashes and fine clinkers which descend through the grate at the several rockings, either when the sections are at rest or when they are rocked, except that the operating means being close to one side of the ash-pit the main space in the ash-pit is clear for operating by any ordinary implement to remove the ashes. A still more important difierence is found when it shall be required for any reason to lift out one or more of the sections of the grate. Nothing is necessary with our invention but to lift each out of its place. In replacing the sections it is only necessary to have the deep notches a clear of ashes to receive the trunnions of the sections and the open slots cland 6 also clear to receive the pins B and O and to be careful in introducing the grate-sections into place to have the parts received in the proper recesses. Our latch I, holding the rocking sections against motion in either direction, supports the sections efficiently for use, with their upper surfaces level, and when the latch is thrown over allows them to be freely rocked in both directions from such level position.

One advantage of our construction is that a better support for the bars D and E near the front ends is provided by the rigid extension of each through the front plate A. The depressed front end E, forged or cast integral with the remainder of the bar E, extends out through the proper low slot at, and the elevated front end D, similarly rigid with the bar D, extends out through its proper high slot, (similarly marked a and the portions both of D and E which move through the plate being parallel to the main portions D and E bear on the bottom of the-slots a and thus give a front bearing additional to the bearings A.

Modifications may be made without departing from'the principle orsacrificing the advantages of the invention.

WVe have shown five sections of the gratethree sections B and two sections 0; but these numbers may be varied, taking care to have them match properly to each other and to the other parts. Instead of engaging the latch I with the slide D it may be engaged with the slide E, or there maybe two latches, either connected or working independently, engaging one with each. The keeper A may be omitted. We have shown each section as made with the arms in duplicate, one at each end. This is of advantage by allowing the section to be reversed if one of the arms isbroken or in any wise defective; but these arms may be omitted at one end.

We claim as our invention 1. A shakingrate mechanism comprising oppositely-rocking sections B and 0 having arms B 0 extending downward and carrying transverse pins 13 O in combination with slides D and'E resting on supports A" and also extending through the front plate at A so as to be guided in right lines, having open slots at e in the upper side of such slides each receiving a pin of one section and having portions between these open slots so low as to avoid contact with the corresponding pin of the opposite section, and an operatinglever G directly connected by a slot and pin to the elevated arm D of one slide and similarly connected "to the depressed arm E of the other. slide, all arranged for joint operation snbstantiallyas herein specified.

2. A shaking-grate mechanism comprising oppositely-rocking sections B and 0 having arms B 0 extending downward and carrying transverse pins B C in combination with slides D and E resting on supports A and also extending through the front plate at A so as to be guided in right lines, having open slots 01 e in the upper sides each receiving a pin of one section and having portions between these slots so low as to avoid contact with the corresponding pin of the opposite section, and an operating-lever G directly connected by a slot and pin to the elevated arm D of one slide, and similarly connected to the depressed arm E of the other slide, these operating means being arranged close to one side of the ash-pit, so as to leave the middle portion of the ash-pit clear of obstruction, all substantially as herein specified.

3. A shaking-grate mechanism comprising lines, having open slots d and e in the upper sides respectively, each receiving. a pin of one section and having portions between these open slots so low as to avoid contact with the corresponding pin of the opposite section, and an operating-lever G directly connected by a slot and pin to the elevated arm D of one slide and similarly connected to the depressed arm E of the other slide, said slides being arranged close to one side of the ash-pit and adapted to engage and give motion to the several sections of the grate however either one or more of the sections on supports A and also extending through the front plate at a so as to be guided in right may be reversed in position and to leave the middle portion of the ash-pit clear of obstrucupper side of the projecting part of one of the slides arranged to stand out from'the front of the furnace when the grate-sections are to be held at rest in the position for use and a swinging latch I turning on a fixed pivot A in the furnace-front, engaging in said notch, and horizontally offset so as to bring it sufficiently out from the front of the furnace to allow it to be easily acted on in raising and depressing it, and the keeper A", all combined and arranged to serve substantially-as herein specified.

AQUILA B. MARSHALL. RICHARD HOUSE, JR. GEO. G.KNIFFIN.

Witnesses:

O. M. BENEDICT, GEORGE V. GREEY. 

